Question: What was the population of Piraeus in 2001?
Paraphrase: Identify the population of Piraeus in 2001.
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q58976 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2001')) }